Great Plains 3N-4025P Operator Manual - Manual (Page 108)

104 3N-40P Table of Contents Index Great Plains Manufacturing, Inc.
196-538M Table of Contents Index 2014-01-29
Row Unit Down Pressure
10HDP Series Down-Pressure
Refer to Figure 141
An adjuster cam sets row unit spring down pressure
individually for each row unit. This is useful for
penetrating hard soil and planting in tire tracks.
The notes in the left table below are based on a drill
without coulters. About 120 pounds (54 kg) of the
down-force is the weight of the row unit itself. The
additional force is due to the springs lifting against the
mass of the drill.
Test, without seeding, in your conditions, to determine
optimal down-force settings.
To adjust down pressure, use an adjustable or open-end
1
1 ⁄
8
inch (29 mm) wrench.
1. Raise the drill. Although this adjustment can be
made with the drill lowered, the springs will be in
tension, and will require more effort. The extra force
required may also damage tools.
2. Put tractor in Park and shut it off.
3. Position wrench on hex nut weldment.
4. Pull upper spring link back.
5. Move the adjustment cam to the new setting on the
spring adjust bar.
2-Spring 10HD Cam Down-Force Settings
These settings apply to 2009+ drills, or updated older
drills, that have two parallel arm springs per row. 4-Spring 10HD Cam Down-Force Settings
These settings apply to older drills, not yet updated
a
, that
have four parallel arm springs per row.
Note: With 4-spring rows, do not set all rows so high that
planting becomes uneven or gauge wheels lift off
ground.
Figure 141: 10HDP:
Row Unit Minimum (one)
and Maximum (six)
27065
1
6
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 125 55
two 140 60
three 155 70
four 185 85
five 215 100
six 245 110
tip Do Not Use
36026
a. Contact your Great Plains dealer for update kit information.
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 250 115
two 275 125
three 310 140
four 370 170
five 430 195
six 490 220
tip Do Not Use
31452